This summer I had a unique opportunity to replace my 1992 Evinrude 225-HP V6 with a 2008 E-TEC 250 H.O. motor. I have made a careful study of the difference in performance between the motors. I also tested the REBEL 17 and CYCLONE 17 propellers against my old favorite SST propeller. And I was also able to compare my traditional analogue gauges to new I-Command digital gauges. The results are far too long to present here, but are published at
http://continuouswave.com/whal....html
where I think many may find interesting reading.
To sum it up as tersely as possible, the E-TEC is faster, quieter, and gets significantly better fuel economy. It runs more smoothly and seems to improve the boat's ride, too. The new propellers perform better, particularly with regard to maintaining grip in rough seas. And the I-Command instrumentation was easy to install.